A chemistry question, not sure. A master who helps to solve

Under the standard condition, the reaction formula with NaOH solution is:

2NaOH + CO2 Na2CO3 H2O If only the above reactions occur, the NAOH consumed is , and the generated Na2CO3 is greater than the final obtained by the question, and it can be seen that CO2 and NaCO3 in water continue to react as follows:

The white solid left by Na2CO3 H2O+ CO2 2NaHCO3 consists of unreacted NaHCO3 and Na2CO3. Let NaHCO3 be XMOL and Na2CO3 be YMOL:

x+y= (mole conservation of carbon atom).

84x＋106y=

The solution is x=, y=

According to the molar conservation of the Na atom to get the NaOH has. So the amount concentration of the substance of the original NaOH solution is.

I rely on my friend, you're a high school student, you have a future!

I don't have trouble doing this question, but I'm tired of typing, so I have to give me some points.

We know that the molar volume of the gas is then there is a total of CO2

If all the reactions produce Na2CO3, then it should be Na2CO3, and the molar mass of Na2CO3 is 106, then the mass of Na2CO3 should be and we only get it now, then it means that CO2 may be excessive, then CO2 excess will convert Na2CO3 into NaHCO3, at this time, we observe whether the amount of CO3 is changed from CO2, then the amount of CO3 is certain, and we should be all Na2CO3. Now it is, so little this should be the amount of Na2CO3 converted into NaHCO3 decreased, and the number of moles converted into NaHCO3 should be, i.e., the final generation and, check the mass of these two substances =

VFB then the mol number of Na is, that is, 100ml of NaOH is contained in the night, and finally the amount and concentration of the substance of NaOH solution is found.

1。Displacement reaction CuSO4 Fe Cu FeSO4

2。Metathesis reaction: CuSO4, 2KOH, Cu(OH)2K2SO4KOH, KSO4, KCL

That woman actually added bacl2 plus k2co3 plus hno3 to heat and evaporate, who knows why do you have so many steps, it's troublesome.

Solid E is BaCO3 and is Hno3 and is most likely HCl

After the above test is completed, the organic matter in the flask needs to be distilled, and the resulting distillate contains (Answer: 1, ethanol volume = total volume of solution = 36ml 25ml 14

If there is g in 1L, the concentration is mol L

The volume of spring water containing 1 mol of magnesium ions is: 1 (2*10 -3) = l = 500 l

106g of Na2CO3 is just 1mol, and the concentration of these two solutions is not the same.

Because the first 106g solid is dissolved in 1 L of water, the volume is no longer 1L, so the concentration is not 1mol L

The second concentration is first dissolved in water, and then diluted to 1L, then its concentration is just 1mol L The reaction formula is written incorrectly: 2CO+O2=2CO2

Co completely reacts to produce CO2 also, the amount of matter is.

The number of nucleated clecone molecules contained is: pcs.

Hope it helps.

2NH3+CO2*****== (certain conditions) CO(NH2)2+H2OM

Then m = that at least the mass of carbon dioxide is required.

ton, if you really don't worry, take the trouble to convert it to moles to calculate, the result is still the same, when there are no other additional conditions, consider the full reaction, do not need to consider the balance, just calculate it.

Calculate the relative molecular mass of ammonia and compare it with carbon dioxide, and the answer is tons.